I know he did a bunch of stuff down at Willy’s in the mid 80’s, including some on Steel Wall. You can find his name throughout Shane Richardson’s West Australian Rock. I’m sure a couple of the older guys can elaborate a little more.

‘The Dreaded Lurgy’ at WCH mentioned by Chris is a 23.
Kim Carrigan has done his share, mostly in the 21 to 25 grade range as far as I can tell looking through my guidebooks, including an old Margaret River book. Shane Richardson has a few 26s to his name.